Does not include Idionycteris or Corynorhinus; see Williams et al. (1970), Tumlinson and Douglas (1992), Frost and Timm (1993), Bogdanowicz et al. (1998), and Hoofer and Van Den Bussche (2001). See C. Jones (1977) for a key to species of Plecotus and Corynorhinus, but note that new species have been described since that publication.